Clean Drupal's packaging script information on info.yml files

[piggito]

Please refer to https://www.drupal.org/docs/creating-custom-modules/let-drupal-know-about-your-module-with-an-infoyml-file#s-complete-example at the end of this section you can see that vesion and project are restricted properties which should only be added by Drupal packaging system.

Moreover, core's update module uses these properties to determine the project's update status which results in an Unsupported report for gigya module as it was marked like that on drupal.org

This PR also removes datestamp property cause it is also useless now as it is also used by update module to look for changes in project status.